System and method for caller control of a distinctive ring

ABSTRACT

A system for a caller to control a distinctive ring for a telephone call includes a service switching point and a service control point. The service switching point is operable to receive a feature code and a called directory number, and to issue a query in response to receiving the feature code. The service control point is operable to receive the query and issue a response to the service switching point. The response includes a distinctive ring parameter. Upon receiving the response from the service control point, the service switching point processes the call so that the distinctive ring parameter causes a distinctive ring signal to be applied to a called telephone line associated with the called directory number.

BACKGROUND

1. Field of the Invention

The invention relates to the field of switched telephony, and moreparticularly to a system and method for caller control of a distinctivering.

2. Description of the Related Art

When placing a call to a called party, a caller may often desire toprovide indicia of his or her identity to the called party, or attractthe attention of the called party so that the called party is morelikely to answer the telephone. A caller may do so by controlling thering pattern of the called party's telephone. This is accomplished bythe caller invoking a distinctive ring control feature. Present systemsprovide for a distinctive ring if the call originates from a particularcalling directory number, or a distinctive ring if the called directorynumber belongs to a predetermined call group, or a plurality ofdistinctive rings corresponding to a plurality of directory numbersassigned to a single telephone line. These systems, however, do notprovide for caller control of a distinctive ring for a directory numberspecified by the caller.

SUMMARY

According to the invention, a telephone network includes a serviceswitching point and a service control point. The service switching pointis operable to receive a feature code and a called directory numberinput by a calling party placing a call, and to issue a query inresponse to receiving the feature code. The service control point is incommunication with the service switching point over a communicationpath, and is operable to receive the query and issue a response to theservice switching point. The response includes a distinctive ringparameter. Upon receiving the response from the service control point,the service switching point processes the call so that the distinctivering parameter causes a distinctive ring signal to be applied to acalled telephone line associated with the called directory number.

Also according to the invention, a method of processing a call placed bya calling party to a called telephone line in a telephone network isprovided. The telephone network includes a service switching point and aservice control point in communication with the service switching pointover a communication path. The method includes the steps of receiving atthe service switching point a feature code and a called directorynumber. The called directory number is associated with the calledtelephone line. A query is sent from the service switching point to theservice control point after receiving the feature code, and the servicecontrol point generates a response to the query. The response includes adistinctive ring parameter. The response is sent to the serviceswitching point, which then processes the call after receiving thedistinctive ring parameter in the response. A distinctive ring signalbased on the distinctive ring parameter is applied to the calledtelephone line.

Also according to the invention, a system for caller control of adistinctive ring is provided. The system includes a service switchingpoint serving a calling telephone line. The service switching point isoperable to receive from the calling telephone line a feature code and acalled directory number associated with the called telephone line. Inresponse to receiving the feature code, the service switching pointissues a query. A service control point in communication with theservice switching point over a first communication path is operable toreceive the query and issue a response that includes a distinctive ringparameter. Upon receiving the response, the service switching pointprocesses the call so that upon connection of the call the distinctivering parameter causes a distinctive ring signal to be applied to thecalled telephone line. The distinctive ring signal is applied to thecalled telephone line independent of services associated with the calledtelephone line.

Also according to the invention, another method for a caller to controla ring pattern signal applied to a called telephone line in a telephonenetwork providing a plurality of services includes the steps ofreceiving a first code and a called directory number input by the callerand associating the called directory number with the called telephoneline. A modified ring pattern signal is then applied to the calledtelephone line in response to the first code and independent of servicesassociated with the called telephone line.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of an exemplary Advanced Intelligent Network(AIN) environment;

FIG. 2 is a flow diagram illustrating an exemplary process for a callerto control a ring pattern signal applied to a called telephone line;

FIG. 3 is a flow diagram illustrating the exemplary process of FIG. 2 asimplemented in an AIN environment;

FIG. 4 is a flow diagram illustrating another exemplary process for acaller to control a ring pattern signal, subject to an authorizationcode;

FIG. 5 is a flow diagram illustrating another exemplary process for acaller to control a ring pattern signal, subject to a directory numberassociated with a feature code; and

FIG. 6 is a flow diagram illustrating another exemplary process for acaller to control a ring pattern signal, subject to a directory numberassociated with the caller and an authorization code.

DETAILED DESCRIPTION

The system and method according to the invention provide a callercontrolled distinctive ring. Upon placing a call to a called directorynumber in a telephone network, a caller accesses a distinctive ringcontrol feature. Accessing the distinctive ring control causes adistinctive ring signal to be applied to a called telephone lineassociated with the called directory number. The distinctive ring signalin turn causes a terminating device connected to the telephone line,such as a telephone, to ring with a distinctive ring.

In an illustrative embodiment, the distinctive ring control feature isaccessed by dialing a feature code associated with the distinctive ringcontrol. The feature code is dialed with the called directory numberwhen the caller places the call.

In another illustrative embodiment, the distinctive ring control causesa distinctive ring signal to be applied to the called telephone lineindependent of distinctive ring services associated with the calledtelephone line. Thus, the calling party determines whether a distinctivering will announce the call. Furthermore, the distinctive ring signalcan be applied to any telephone line connected to the telephone network.

In yet another illustrative embodiment, an authorization code isprovided to the calling party so that the calling party can limit accessto the distinctive ring control. Furthermore, the calling party ischarged a fee each time the calling party uses the distinctive ringcontrol feature, and the authorization code identifies the callingparty. Thus, the calling party call can use the distinctive ring controlfeature from any telephone in the network, and the resulting fee ischarged to the calling party's telephone service bill.

Referring now to FIG. 1, the system 10 is illustratively implemented inan Advanced Intelligent Network (AIN). The architecture of the AIN iswell known to those of ordinary skill in the art, and illustrativelyincludes Service Switch Points (SSP) 20 and 30, a Signal Transfer Point(STP) 40, a Service Control Point (SCP) 50, a Service Management System(SMS) 60, and a Service Node (SN) 70. The SSP 20 and SSP 30 areconnected by trunk circuits 100. Additionally, the SSP 20 is connectedto another SSP (not shown) by trunk circuits 102, and the SSP 30 isconnected to another SSP (not shown) by trunk circuits 104. The SSP 20is further coupled to the STP 40 by a signaling link 110, and the SSP 30is further coupled to the STP 40 by a signaling link 120. Similarly, theSTP 40 is coupled to the SCP 50 by a signaling link 130; the SCP 50 isconnected to the SMS 60 by a signaling link 140; and the SMS 60 isconnected to the SN 70 by a signaling link 150. The SN 70 is alsoconnected to the SSP 20 by an Integrated Service Digital Network (ISDN)160.

The system 10 illustratively includes the SSP 20 and the SCP 50. The SSP20 is operable to receive the feature code and the called directorynumber input by the calling party, and is further operable to issue aquery in response to receiving the feature code. The SCP 50 is operableto receive the query and issue a response to the SSP 20. The responseincludes a distinctive ring parameter. Upon receiving the response fromthe SCP 50, the SSP 20 processes the call so that the distinctive ringparameter causes a distinctive ring signal to be applied to a calledtelephone line associated with the called directory number.

1. Exemplary Operating Environment

Referring again to FIG. 1, a more detailed description of the exemplaryAIN environment is now provided. Communications in the AIN 10 networkoccur over the trunk circuits 100, 102 and 104, the signaling links 110,120, 130 140 and 150, and over the ISDN 160. These communications arecovered by the Signaling System 7 (SS7) communications protocol and theAIN communications protocol. These protocols are described in moredetail in the documents entitled “Bell Communications ResearchSpecification of Signaling System 7,” Document TR-NWT-000246, Issue 2(June 1991), plus Revision 1 (Dec. 1991), and Bellcore SpecificationGR-1298-CORE Switching Systems Generic Requirements for AIN, which areincorporated herein by reference.

The trunk circuits 100 are the voice path trunks, or voice channels,over which voice and data communications between a calling party andcalled party are established when calls are connected. The signalinglinks 110, 120, 130, 140 and 150 are bi-directional channels employingthe SS7 protocol. Typically, the signaling links 110, 120, 130, 140 and150 transmit SS7 messages at a 56 or 64 kilobit per second (kbps) rate.This is referred to as out-of-band signaling because the signaling doesnot take place over the voice channels in the trunk circuits 100, 102and 104.

The SSP 20 serves a dedicated group of telephone lines.Telecommunication customers subscribe to one or more of these telephonelines. The telephone lines connect the SSP 20 to terminating devices,such as telephones or electronic communication devices. As illustrated,a telephone line 21 connects the SSP 20 to a telephone 22, and atelephone line 23 connects the SSP 20 to a telephone 24. Likewise, theSSP 30 also serves a dedicated group of telephone lines, includingtelephone line 31, which connects the SSP 30 to a telephone 32, andtelephone line 33, which connects the SSP 30 to an electroniccommunication device 34. The electronic communication device 34 can be afacsimile machine, computer modem, or other electronic communicationdevices designed to transmit electronic communication device data over avoice channel.

Each of the telephone lines 21, 23, 31 and 33 is assigned a directorynumber. A directory number is a number that is dialed or input by anoriginating terminating device at a calling telephone line to reach aterminating device on a called telephone line associated with thedirectory number. Thus, a directory number is typically input into atelephone or electronic communication device to establish a voicechannel to another telephone or electronic communication device attachedto the network.

The SSPs 20 and 30 are connected to the STP 40 via the signaling links110 and 120, respectively. The STP 40 is a multi-port high speed packetswitch that routes each incoming message to an outgoing signaling linkbased on routing information contained in the SS7 message.

The STP 40 is connected to the SCP 50 via the signaling link 130. TheSCP 50 contains programmable service-independent capabilities (orservice logic) that are under control of the telephone serviceproviders, and also contains subscriber databases that are used toprovide advanced call-processing capabilities to a subscriber.

The SMS 60 is connected to the SCP 50 via the signaling link 140. TheSMS 60 interfaces with the offices of the telephone service providersand provides a platform for remotely provisioning the SCP 50 to provideadvanced call-processing capability to a subscriber. Thus, when acustomer subscribes to certain AIN services, or modifies an ensemble ofAIN services, the telephone service provider provides this informationto the SCP 50 via the SMS 60.

The SN 70 includes voice and dual tone multi-frequency (DTMF) signalrecognition devices and voice synthesis devices. The SN 70 is connectedto the SMS 60 via the signaling link 150, and is also connected to theSSP 20 via the ISDN link 160. The SN 70 is typically employed in an AINservice to provide voice channel connection to a call or transfer datato a subscriber over a switched connection during or after a call.

Set-up, management and release of trunk circuits that carry voicechannel data between an originating station and terminating station isgoverned by the ISDN User Part (ISUP) protocol known to those ofordinary skill in the art of telephone switching. A caller may place acall to a directory number served by the same SSP from which the call isplaced, or may place a call to a directory number served by a differentSSP from which the call is placed. Upon logical completion of the call,the system 10 rings the called line by providing a ring signal to thecalled telephone line associated with the called directory number,which, in turn, causes a terminating device connected to the called lineto ring. Modifying the ring signal from a default normal ring signalresults in a distinctive ring at the terminating device.

Call set-up differs between calls that originate and terminate at thesame SSP and calls that originate and terminate at different SSPs. Callsthat originate and terminate at the same SSP do not use ISUP signaling.For example, if a caller places a call from the telephone 22 to adirectory number associated with the telephone line 23, ISUP signalingis not required. Thus, if the telephone 24 is not in use, the SSP 20will connect the call to the telephone line 23.

However, if a caller places a call from the telephone 22 to a directorynumber associated with the telephone line 31, the call is placed to theSSP 30, which is an out-of-switch number. The SSP 20 transmits an ISUPInitial Address Message (IAM) to reserve an idle trunk circuit betweenthe SSPs 20, 30. The IAM includes data related to the called party andcalling party, and is routed via the STP 40. Upon receipt of the IAM,the SSP 30 examines the dialed directory number, determines that itserves the telephone line 31, and that the telephone line 31 isavailable for ringing. The SSP 30 then applies a ring pattern signal tothe telephone line 31, and then transmits an Address Complete Message(ACM) to the SSP 20 via the STP 40. Upon receiving the ACM, the SSP 20provides a ring signal heard by the calling party and connects thetelephone line to the reserved trunk to complete the voice circuit fromthe calling party to the called party. If a voice channel is availableover the trunk circuits 100, communication between the telephones 22 and32 occurs over a voice channel located in the trunk circuits 100. If allof the trunk circuits 100 are allocated, however, a voice channel isestablished between the SSPs 20 and 30 through at least one other SSP(not shown) and the trunk circuits 102 and 104.

2. Exemplary Modes of Operation

FIG. 2 provides a flow diagram 200 illustrating an exemplary process fora caller to control a ring pattern signal applied to a called line. Instep 202, a caller accesses a distinctive ring control feature.Accessing the distinctive ring control feature notifies the system 10that a distinctive ring signal will be applied to the called telephoneline. The called directory number need not be associated with adistinctive ring service, or any other telecommunications service, norbe associated with a calling group. Instead, the caller determineswhether the distinctive ring signal will be applied to the calledtelephone line. Accordingly, the caller can control the ring pattern forany terminating device attached to the network independent ofdistinctive ring services provided to the called directory numberassociated with the terminating device.

Additionally, the distinctive ring control feature may be accessed froma directory number not associated with the caller; i.e. the caller neednot place a call from a directory number associated with a distinctivering service. Accordingly, the caller can control the ring pattern forany terminating device attached to the network from any terminatingdevice attached to the network.

In step 204, the caller dials the directory number to place the call. Instep 206, the call is completed, and a distinctive ring pattern signalis applied to a telephone line associated with the directory number. Theterminating device connected to the telephone line will then ring with adistinctive ring.

FIG. 3 provides a flow diagram 300 illustrating the exemplary process ofFIG. 2 as implemented in an AIN environment used by a telecommunicationsservice provider. In step 302, the caller dials a distinctive ringcontrol feature code and the directory number to place a call. A featurecode is an indicator of a status of a communication. The feature code isa code entered by the caller at the caller's telephone, e.g. *77. Thefeature code is provisioned with a Feature Access Code (FAC) trigger bythe telecommunications service provider.

In step 304, the SSP 20 receives the directory number dialed and thefeature code. The FAC trigger will then be activated at the SSP 20,causing the SSP 20 to launch a query to the SCP 50. The query is anInfo_Analyzed message sent from the SSP 20 to the SCP 50 over asignaling link in accordance with the SS7 signaling standards. TheInfo_Analyzed query includes data related to the dialed feature code,the calling directory number, and the called directory number.

In step 306, the SCP 50 receives the Info_Analyzed query from the SSP20. Information related to the distinctive ring control is stored in thesubscriber databases in the SCP 50. The SCP 50 associates theinformation to the dialed feature code contained in the Info_Analyzedquery with the distinctive ring control. Accordingly, the SCP 50provides an Analyze_Route response message back to the SSP 20 in step308. The Analyze_Route response message is provided over a signalinglink in accordance with the SS7 signaling standards. Data included inthe Analyze_Route response include the called directory number and aPassiveLegTreatment parameter. The PassiveLegTreatment parameterincludes a distinctive ring parameter. Processing the call with thedistinctive ring parameter will cause the telephone line associated withthe called directory number to ring with a distinctive ring.

Upon receiving the Analyze_Route response message from the SCP 50, theSSP 20 determines if it serves the called directory number, as shown instep 310. If the SSP 20 does serve the called directory number, the SSP20 applies a distinctive ring signal to the telephone line associatedwith the directory number, as shown in step 312. The distinctive ringsignal is based on the distinctive ring parameter received from the SCP50.

However, if the SSP 20 does not serve the called directory number, theSSP 20 will set up the call to another SSP that does serve the calleddirectory number through the ISUP protocol, as described above. The SSP20 formulates an IAM to reserve an idle trunk circuit, as shown in step316. The IAM includes the PassiveLegTreatment parameter provided by theSCP 50. The PassiveLegTreatment parameter is included in a ServiceAccess Parameter (SAP) in the IAM. The SSP 20 then sends the IAM to theSSP serving the called directory number, as shown in step 318. Uponreceipt of the IAM, the SSP serving the called directory number appliesthe distinctive ring signal to the telephone line associated with thedirectory number, as shown in step 312. Thus, in accordance with theexemplary process of FIG. 3, a caller can control the ring signalapplied to any telephone line of any SSP in the AIN network.Furthermore, the distinctive ring signal is applied to the calledtelephone line independent of distinctive ring services provided to thecalled telephone line.

FIG. 4 provides a flow diagram 400 illustrating another exemplaryprocess for a caller to control a distinctive ring signal, subject to anauthorization code. In step 402, the caller subscribes to a distinctivering control service offered by a telecommunications carrier. When thecaller subscribes to the service, an authorization code is established.The authorization code is either generated automatically by thetelecommunications provider, or is input by the caller. The caller usesthe authorization code to authorize use of the distinctive ring controlservice.

In step 404, the caller enters the distinctive ring control feature codeand dials a directory number. In step 406, the system 10 prompts thecaller to enter the authorization code established in step 402. In step408, the system 10 determines if the caller has input a validauthorization code. If the authorization code is not valid, the system10 applies a normal ring pattern signal to the telephone line associatedwith directory number, as shown in step 410. If, on the other hand, theauthorization code is valid, the system 10 applies a distinctive ringpattern signal to the telephone line associated with the directorynumber, as shown in step 412. Thus, in accordance with the exemplaryprocess of FIG. 4, a caller can control the ring pattern applied to anytelephone line of any SSP in the AIN network from any telephone line ofany SSP in the network, subject to a caller's authorization code.

The exemplary process of FIG. 4 facilitates charging a fee to the callerfor the distinctive ring control service. The distinctive ring controlservice can be offered to a telecommunication service customer based ona periodic fee, such as monthly, quarterly, etc., or can be based on aper-use fee, in which the subscriber is charged a set fee for each useof the service. Furthermore, by providing the caller a uniqueauthorization code, the caller can be charged a per-use fee each timethe distinctive ring control feature is used by the caller, independentof the directory number from which the caller is placing the call. Forexample, the caller can place a call from a public payphone and accessthe distinctive ring control feature. By inputting a uniqueauthorization code, the telephone service provider can charge thecaller's account the per-use fee when the caller uses the distinctivering control service.

Access to the distinctive ring control can also be limited to adirectory number associated with the caller, e.g., the caller's hometelephone number or business telephone number. FIG. 5 provides a flowdiagram 500 describing another exemplary process for a caller to controla distinctive ring, subject to a directory number associated with thecaller. In step 502, the caller subscribes to a distinctive ring controlservice offered by a telecommunications carrier. When the callersubscribes to the service, the feature code used to invoke the serviceis associated with the caller's directory number. Associating thecaller's directory number with the feature code prevents the caller fromcontrolling a distinctive ring when the calling number is not thecaller's directory number.

In step 504, the caller enters a feature code and dials a directorynumber from a calling number. The directory number from which the calleris placing the call is the calling number. In step 506, the system 10determines if the feature code entered by the caller is associated withthe calling number from which the caller is placing the call. If thecalling number is associated with the feature code, then the system 10applies the distinctive ring pattern signal to the telephone lineassociated with the called directory number, as shown in step 508.However, if the calling number is not associated with the feature code,then the system 10 applies the normal ring pattern signal to the lineassociated with the called directory number, as shown in step 510. Thus,according to the exemplary embodiment of FIG. 5, a caller subscribing toa distinctive ring control service can access the service only from adirectory number associated with the caller.

In addition limiting access to the distinctive ring control to adirectory number associated with the caller, access can also be furtherlimited by establishing an authorization code. FIG. 6 provides a flowdiagram 600 illustrating another exemplary process for a caller tocontrol a distinctive ring, subject to a directory number associatedwith the caller and an authorization code.

In step 602, the caller subscribes to a distinctive ring control serviceoffered by a telecommunications carrier. When the caller subscribes tothe service, the feature code used to invoke the service is associatedwith the caller's directory number, and an authorization code isestablished. Associating the caller's number to the feature codeprevents the caller from controlling a distinctive ring when the callingnumber is not the caller's directory number.

The authorization code is either generated automatically by thetelecommunications provider, or is input by the caller. The caller usesthe authorization code to authorize use of the distinctive ring controlservice.

In step 604, the caller enters a feature code and dials a directorynumber. In step 606, the system 10 determines if the feature codeentered by the caller is associated with the calling number from whichthe caller is placing the call. If the calling number is not associatedwith the feature code, the system 10 applies the normal ring patternsignal to the line associated with the called directory number, as shownin step 608. However, if the calling number is associated with thefeature code, then the system 10 prompts the caller to enter anauthorization code, as shown in step 610.

In step 612, the system 10 determines if the caller has input a validauthorization code. If the authorization code is not valid, the system10 applies a normal ring pattern signal associated with the directorynumber, as shown in step 608. If, on the other hand, the authorizationcode is valid, the system 10 applies a distinctive ring pattern signalto the telephone line associated with the directory number, as shown instep 614. Thus, according to the disclosure of FIG. 6, a callersubscribing to a distinctive ring control service can access the serviceonly from a directory number associated with the caller, and only uponentering a valid authorization code.

The system and method and the exemplary modes of operation have beenillustrated with a telecommunications customer subscribing to theservice. Of course, the service may also be provided free of charge bythe telephone service provider. Furthermore, while access to thedistinctive ring control has been illustrated by use of a feature code,other methods of accessing the distinctive ring control feature are alsocontemplated, such as dialing an access directory number.Illustratively, the access directory number is a toll free number. TheSN 70 connects the call of the toll free number, and prompts the callerto enter a directory number to place a call. A call is then placed tothe directory number entered by the caller, and a distinctive ringsignal is applied to the telephone line associated with the directorynumber.

The embodiments described herein are examples of structures, systems ormethods having elements corresponding to the elements of the inventionrecited in the claims. This written description may enable those ofordinary skill in the art to make and use embodiments having alternativeelements that likewise correspond to the elements of the inventionreceived in the claims. The intended scope of the invention thusincludes other structures, systems or methods that do not differ fromthe literal language of the claims, and further includes otherstructures, systems or methods with insubstantial differences from theliteral language of the claims.

1. A telephone network, comprising: a first service switching pointbeing operable to receive a feature code and a called directory numberinput by a calling party placing a call, and to issue a query inresponse to receiving the feature code; and a service control point incommunication with the first service switching point over a firstcommunication path, the service control point being operable to receivethe query and issue a response to the first service switching point, theresponse including a distinctive ring parameter; wherein upon receivingthe response from the service control point the first service switchingpoint processes the call so that the distinctive ring parameter causes adistinctive ring signal to be applied to a called telephone lineassociated with the called directory number; wherein the first serviceswitching point further operable to receive an authorization code, andinclude the authorization code in the query; and the service controlpoint is further operable to determine whether the authorization code isvalid or invalid, and provides the distinctive ring parameter only upondetermining that the authorization code is valid; wherein theauthorization code is a unique code associated with the calling party,and is generated automatically or determined by the calling party uponsubscribing to a distinctive ring control service.
 2. The telephonenetwork of claim 1, wherein the calling party is charged a fee upon theservice control point determining the authorization code is valid. 3.The telephone network of claim 1, wherein the calling party is charged afee upon the call being answered.
 4. The telephone network of claim 1,wherein the first service switching point is further operable to issuethe query independent of a calling telephone line from which the featurecode is received.
 5. The telephone network of claim 4, wherein thedistinctive ring parameter causes the distinctive ring signal to beapplied to the called telephone line independent of services associatedwith the called telephone line.
 6. The telephone network of claim 1,wherein the distinctive ring parameter causes the distinctive ringsignal to be applied to the called telephone line independent ofservices associated with the called telephone line.
 7. The telephonenetwork of claim 6, wherein the first service switching point is furtheroperable to issue the query independent of a calling telephone line fromwhich the feature code is received.
 8. The telephone network of claim 6,further comprising a second service switching point, the second serviceswitching point serving the called directory number and in communicationwith the first service switching point over a second communication path,and wherein the first service switching point provides the secondservice switching point the distinctive ring parameter received from theservice control point.
 9. A method of processing a call placed by acalling party to a called telephone line in a telephone network, thetelephone network comprising a first service switching point, a secondservice switching point and a service control point, the service controlpoint in communication with the first and second service switchingpoints over first and second communication paths, respectively, themethod comprising the steps of: receiving at the first service switchingpoint an authorization code; including the authorization code in thequery, wherein the authorization code is a unique code associated withthe calling party, and is generated automatically or determined by thecalling party upon subscribing to a distinctive ring control service;determining at the service control point whether the authorization codeis valid or invalid; and providing the distinctive ring parameter if theauthorization code is valid.
 10. The method of claim 9, furthercomprising the steps of charging the calling party a fee if theauthorization code is valid.
 11. The meted of claim 9, wherein the stepof sending the query from the first service switching point to theservice control point after receiving the feature code is independent ofa calling telephone line from which the feature code is received. 12.The method of claim 11, wherein the step of applying the distinctivering signal to the called telephone line is independent of servicesassociated with the called telephone line.
 13. The method of claim 9,wherein the step of applying the distinctive ring signal to the calledtelephone line is independent of services associated with the calledtelephone line.
 14. The telephone network of claim 9, further comprisingthe step of sending from the first service switching point to the secondservice switching point the distinctive ring parameter received from theservice control point if the second service switching point serves thecalled telephone line.
 15. A system for caller control of a distinctivering, the system comprising: a first service switching point serving acalling telephone line and being operable to receive from the callingtelephone line a feature code and a called directory number associatedwith a called telephone line, and to issue a query in response toreceiving the feature code; and a service control point in communicationwith the first service switching point over a first communication path,the service control point being operable to receive the query and issuea response to the first service switching point, the response includinga distinctive ring parameter; wherein upon receiving the response fromthe service control point the first service switching point processesthe call so that upon connection of the call distinctive ring parametercauses a distinctive ring signal to be applied to the called telephoneline independent of services associated with the called telephone line;wherein the first service switching point is further operable to issuethe query independent of the calling telephone line; wherein the firstservice switching point is further operable to receive an authorizationcode and include the authorization code in the query; and the servicecontrol point is further operable to determine whether the authorizationcode is valid or invalid, and provides the distinctive ring parameteronly upon determining that the authorization code is valid; wherein theauthorization code is a unique code associated with the calling party.16. The system of claim 15, wherein the calling party is charged a feeupon the service control point determining the authorization code isvalid.
 17. The method of claim 15, wherein if the service control pointdetermines the authorization code is invalid the first service switchingpoint processes the call so that upon connection of the call a normalring signal is applied to the called telephone line.